Exposure preventing shade

Details Exposure preventing shade Exposure preventing shade

1977-06-29

1978-08-22

Gonzales, John

354154, 354210, G03B 1750

Patent

active

041092597

ABSTRACT:
A reflex camera having a film chamber for supporting a film cassette having a film unit therein in position for exposure and a motor driven spread roller assembly mounted in position to receive an exposed film unit therebetween as it is being advanced from the film cassette and spread a processing fluid across an element of the film unit to initiate the formation of a visible image therein. During viewing of the subject through the camera's objective, an opaque shade or curtain having an exposure aperture therein is mounted between the objective and the film unit with the exposure aperture located out of alignment with the exposure aperture in the film cassette thereby preventing inadvertent exposure of the film unit during the viewing operation. Subsequent to depressing an exposure initiating button, the shade is partially wound upon a first roller while simultaneously being unwound from a second roller to bring the exposure aperture in the shade into alignment with the exposure aperture in the film cassette in preparation for exposure of the film unit. The second roller is provided with a gear which is adapted to move in and out of mesh with a gear on one of the spread rollers. After the film unit has been exposed, the motor is energized to drive the spread roller having the gear thereon which in turn, due to its mesh with the gear on the second roller, rotates the latter to wind the shade upon the second roller while simultaneously unwinding it from the first roller thereby moving the exposure aperture in the shade out of alignment with the exposure aperture in the film cassette. A solenoid is provided for moving the gear on the second roller out of mesh with the gear on the spread roller to allow the shade to be again wound upon the first roller in preparation for the exposure of the next film unit.

REFERENCES:
patent: 3608456 (1971-09-01), Hauser

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